# "Explain" questions — OCR A-Level Biology B — Advancing Biology (H422)

> 94 questions · biology

## How to answer

WHAT + WHY. Every point paired with a because. Structure: X happens because Y. This causes Z because … Assessment Objective: AO2. Every "explain" answer on this spec is marked against exactly this pattern.

## Sample questions

1. [A fish obtains oxygen from water by passing water over its gills. Explain how the gills of a fish are adapted to allow e…](https://www.gradenine.co.uk/q/a-fish-obtains-oxygen-from-water-01bac439)
2. [A marine ecosystem contains phytoplankton (producers), krill (primary consumers), fish (secondary consumers) and seals (…](https://www.gradenine.co.uk/q/a-marine-ecosystem-contains-phytoplankton-producers-03301705)
3. [A scientist is studying how plants transport substances around their bodies. Explain how the structure of phloem tissue …](https://www.gradenine.co.uk/q/a-scientist-is-studying-how-plants-03fa34f6)
4. [A species of Arctic fox lives in a tundra ecosystem. The foxes have white fur and feed on lemmings. Over many generation…](https://www.gradenine.co.uk/q/a-species-of-arctic-fox-lives-08a8a9d3)
5. [A farmer wants to improve the fertility of their soil by making compost from dead plant material. Explain why the rate o…](https://www.gradenine.co.uk/q/a-farmer-wants-to-improve-the-09329c87)
6. [Scientists have used genetic engineering to produce insulin in bacteria. Explain how a human insulin gene is inserted in…](https://www.gradenine.co.uk/q/scientists-have-used-genetic-engineering-to-09e54b56)
7. [A couple have been trying to conceive a child for over two years without success. A doctor diagnoses one partner with in…](https://www.gradenine.co.uk/q/a-couple-have-been-trying-to-0b616862)
8. [A gardener notices that fruit left on the ground in summer rots much faster than fruit stored in a cold cellar over wint…](https://www.gradenine.co.uk/q/a-gardener-notices-that-fruit-left-13be55d2)

## Related

- [OCR A-Level Biology B — Advancing Biology (H422) revision notes](https://www.gradenine.co.uk/learn/ocr-a-level-biology-b-advancing-biology-h422)
- [OCR A-Level Biology B — Advancing Biology (H422) past papers](https://www.gradenine.co.uk/past-papers/ocr-a-level-biology-b-advancing-biology-h422)
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